[R-390] Schematic Discrepancy..

[Optonline]

Hi all.. Again!

I think I just figured it out..

It looks like someone swapped the C533 and C538 cap  physical locations..
While they are wired correctly, the two caps were placed in the wrong 
physical locations.

C538 is a .1uF heater bypass cap and is connected to pin 3.. but is sitting 
in the C533 location
C533 is indeed a .033uF cap and is part of the screen circuit for V505... 
and sits in the C538 location..

Good grief..
Time to call it a night.. ;)


Steve



----- Original Message ----- 
From: "Optonline" <stevejxl at optonline.net>
To: <R-390 at mailman.qth.net>
Sent: Thursday, July 02, 2009 2:17 AM
Subject: [R-390] Schematic Discrepancy..


>
>
> Hi All!
>
> A quick question for the experts...
> While plowing thorugh the re-cap'ing of my IF section module, I have come 
> upon a curious schematic discrepancy..
>
> My '55 Collins-built  IF module has a .1uF cap stuffed in the C533 
> location, with a connection between pin 3 of V505 and chassis ground.
>
> The Navships manual I own indicates C533 should be a .033uF cap between 
> pin 6 of V505 and ground, and no cap between pin 3 and ground. I'm certain 
> this is due to the many design changes over the years..
>
> Which is correct?
> Does anyone know where I could find the propper vintage schematics?
>
> Stev Uckerman, N2JXL
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